Electric power tool

Abstract

To provide an electric work machine capable of suppressing discomfort to a user when a battery for electrically conduction of a motor is changed.SOLUTION: An electric work machine of an aspect of the present disclosure includes a motor, a first connection part, a second connection part, an electrical conduction part, an operation part, and a control part. The electrical conduction part is configured to cause a selected connection part that is one of the first connection part and the second connection part to electrically conduct with the motor. In response to instruction of activation of the motor via the operation part, the control part performs first soft start, and in response to a change of the selected connection part via the electrical conduction part, the control part performs second soft start of increasing the rotation speed more gradually than in the first soft start.SELECTED DRAWING: Figure 10

Description

[Technical field]

[0001] The present disclosure relates to an electric work machine. [Background technology]

[0002] The voltage supply device described in Patent Document 1 includes a first battery pack, a second battery pack, a first switching circuit, and a second switching circuit, and supplies power from one of the battery packs to a motor. The first switching circuit is provided in a first supply path from the first battery pack to the blower, and brings the first battery pack and the motor into a cutoff state or a conduction state. The second switching circuit is provided in a second supply path from the second battery pack to the motor, and brings the second battery pack and the motor into a cutoff state or a conduction state.

[0003] The voltage supply device electrically disconnects the first supply path from the second supply path by using the first switching circuit and the second switching circuit, thereby suppressing charging from the first battery pack to the second battery pack and charging from the second battery pack to the first battery pack. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2020-31486 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the voltage supply device, the battery pack that supplies power to the motor is automatically switched. When switching the battery pack, the first battery pack and the motor are disconnected, and then the second battery pack and the motor are connected. Therefore, when switching the battery pack, the power supply to the motor is temporarily stopped and the motor is restarted. As a result, a relatively large change in the rotation speed occurs unintentionally, which makes the user feel uncomfortable.

[0006] One aspect of the present disclosure provides an electric operating machine capable of suppressing a sense of discomfort felt by a user when a battery supplying electricity to a motor is changed. [Means for solving the problem]

[0007] An electric operating machine according to one aspect of the present disclosure includes a motor, a first connection unit, a second connection unit, a current supply unit, an operation unit, and a control unit. The first connection unit is configured to be connected to a first battery. The second connection unit is configured to be connected to a second battery. The current supply unit is configured to energize a selective connection unit, which is one of the first connection unit and the second connection unit, with the motor. The operation unit is configured to be operated to instruct starting or stopping of the motor. The control unit is configured to execute a first soft start that gradually increases the rotation speed of the motor in response to a command to start the motor via the operation unit, and execute a second soft start that increases the rotation speed more gently than the first soft start in response to a command to start the motor via the current supply unit.

[0008] The above-mentioned electric working machine executes a first soft start when a command to start the motor is issued via the operation unit, i.e., when the user intentionally starts the motor. The above-mentioned electric working machine also executes a second soft start when a change occurs in the battery that energizes the motor, i.e., when the motor starts unintentionally by the user. In the second soft start, the rotation speed increases more slowly than in the first soft start, so that a relatively large change in the rotation speed does not occur in a short period of time. Therefore, it is possible to suppress a sense of discomfort felt by the user when the battery that energizes the motor is changed. [Brief description of the drawings]

[0009] [Figure 1] FIG. 2 is a diagram showing the appearance of the dust collector in the first embodiment with the cover closed. [Diagram 2] FIG. 2 is a diagram showing the appearance of the dust collector according to the first embodiment with the cover open. [Diagram 3] FIG. 2 is a block diagram showing the electrical configuration of the dust collector according to the first embodiment. [Figure 4] 4 is a flowchart showing a motor control process according to the first embodiment. [Figure 5A] 5 is a flowchart showing a part of a powered battery determination process according to the first embodiment. [Figure 5B] 10 is a flowchart showing another part of the powered battery determination process according to the first embodiment. [Figure 5C] 10 is a flowchart showing the remaining part of the powered battery determination process according to the first embodiment. [Figure 6] 4 is a table showing first and second threshold values ​​according to speed modes according to the first embodiment. [Figure 7] 5 is a flowchart showing battery switching control according to the first embodiment. [Figure 8] 4 is a flowchart showing motor output control according to the first embodiment. [Figure 9] 5 is a table showing target duties and increased duties according to speed modes according to the first embodiment. [Figure 10] 4 is a time chart showing the change over time in the rotation speed of the motor according to the first embodiment. [Figure 11A] 10 is a flowchart showing a part of a motor output control according to a second embodiment. [Figure 11B] 10 is a flowchart showing the remaining part of the motor output control according to the second embodiment. [Figure 12] 13 is a table showing target rotation speeds and increased rotation speeds according to speed modes according to the second embodiment. [Figure 13] 10 is a table showing reference duties with respect to command rotation speeds according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] [Summary of the embodiment] An electric operating machine in one embodiment may include a motor, a first connection unit, a second connection unit, a current supply unit, an operation unit, and a control unit.

[0011] The control unit may be configured to control the motor based on the pulse width modulation signal. The control unit may be configured to gradually increase a duty of the pulse width modulation signal when a first soft start is performed, and to increase the duty more slowly when a second soft start is performed than when the first soft start is performed.

[0012] In pulse width modulation control, the duty is increased more gradually in the second soft start than in the first soft start, making it possible to suppress relatively large changes in the rotation speed at the start of the motor.

[0013] The above-mentioned electric operating machine may further include a rotation speed detection unit configured to detect the rotation speed of the motor. The control unit may be configured to control the motor so that the rotation speed detected by the rotation speed detection unit becomes a target rotation speed. The control unit may be configured to gradually increase a command rotation speed, which is a command value for the rotation speed of the motor, when the first soft start is performed, and to increase the command rotation speed more gently when the second soft start is performed than when the first soft start is performed.

[0014] In the constant rotation speed control, the command rotation speed is increased more gradually in the second soft start than in the first soft start, thereby making it possible to suppress a relatively large change in the rotation speed when the motor is started.

[0015] The above-mentioned electric operating machine may further include a speed setting unit configured to be operated to set one of a plurality of speed modes having mutually different target values ​​related to the rotation speed. The control unit may be configured to drive the motor based on the target value of the speed mode set via the speed setting unit. The control unit may be configured to change the rate of increase of the rotation speed in accordance with the speed mode set via the speed setting unit when the second soft start is performed.

[0016] By changing the rate of increase in the rotation speed in the second soft start depending on the speed mode, the user can feel that the increase in the rotation speed in the second soft start is more gradual than in the first soft start.

[0017] The multiple speed modes may include a first mode and a second mode in which a target value is smaller than that of the first mode. The control unit may be configured to reduce a rate of increase in the rotation speed when the second mode is set via the speed setting unit, compared to when the first mode is set via the speed setting unit, during execution of the second soft start.

[0018] If the rotation speed is increased at the same rate as in the first mode in the second mode, when the energizing battery is changed in the first mode, the user is less likely to realize that the increase in the rotation speed is more gradual than in the first soft start. By reducing the rate of increase in the rotation speed when the second mode is set in the second soft start compared to when the first mode is set, it is possible to prevent the user from feeling uncomfortable when the energizing battery is changed in the second mode.

[0019] The control unit may be configured to increase the rotation speed at a first increase rate when performing a first soft start, and to increase the rotation speed at a second increase rate that is less than half of the first increase rate when performing a second soft start.

[0020] In the second soft start, the rotation speed increases at a second increase rate that is less than half of the first increase rate in the first soft start, allowing the user to realize that the rotation speed increases more slowly in the second soft start than in the first soft start.

[0021] In some embodiments, the above-mentioned features may be combined in any combination, and in some embodiments, any of the above-mentioned features may be omitted. Hereinafter, embodiments of the present disclosure will be described with reference to the drawings.

[0022] 1. First embodiment <1-1. Overall composition> The configuration of an electric operating machine 100 according to this embodiment will be described with reference to Figures 1 and 2. In this embodiment, the electric operating machine 100 is a dust collector.

[0023] The electric work machine 100 has a rectangular parallelepiped main body 110. The electric work machine 100 has four wheels 14 on the bottom of the main body 110. A circular hose attachment hole 13 is provided at the lower end of the front surface of the main body 110. A hose (not shown) for sucking up dust, cutting chips, and the like is attached to the hose attachment hole 13.

[0024] The electric operating machine 100 has a cover 10 on the front of a main body 110. The cover 10 is configured so that the lower end can rotate around the upper end as an axis. A rectangular window 10a is provided in the center of the cover 10. The window 10a is a hole that penetrates the cover 10.

[0025] As shown in Fig. 2, the electric operating machine 100 has a first connection part 210A and a second connection part 210B on the inside of the cover 10. A first battery 200A is connected to the first connection part 210A. A second battery 200B is connected to the second connection part 210B. The first battery 200A and the second battery 200B are the same type of battery with the same rated voltage. The first battery 200A and the second battery 200B are secondary batteries that can be repeatedly charged and discharged, such as lithium ion batteries.

[0026] When the first battery 200A detects an abnormal state of the first battery 200A, it outputs a discharge prohibition signal to the electric work machine 100 via the first connection unit 210A. When the first battery 200A does not detect an abnormal state of the first battery 200A, it outputs a discharge permission signal to the electric work machine 100 via the first connection unit 210A. The abnormal state includes an over-discharge state, an over-temperature state, an overload state, etc. of the first battery 200A. The discharge permission signal is a signal that permits discharge from the first battery 200A, and the discharge prohibition signal is a signal that requests prohibition of discharge from the first battery 200A.

[0027] Similarly, when the second battery 200B detects an abnormal state of the second battery 200B, it outputs a discharge prohibition signal to the electric work machine 100 via the second connection part 210B, and when the second battery 200B does not detect an abnormal state of the second battery 200B, it outputs a discharge permission signal to the electric work machine 100 via the second connection part 210B.

[0028] The first battery 200A and the second battery 200B are not used at the same time. That is, only one of the first battery 200A and the second battery 200B is discharged, and they are not discharged at the same time. In this embodiment, the first battery 200A is used preferentially, and the second battery 200B is used when the first battery 200A cannot be used. Note that the electric working machine 100 may have three or more connection parts, and three or more batteries may be connected to the electric working machine 100. When three or more batteries are connected to the electric working machine 100, the electric working machine 100 uses one of the three or more batteries in order.

[0029] The electric operating machine 100 is provided with a drive switch 17 at the front end of the top surface of the main body 110. The drive switch 17 corresponds to an operation unit configured to be operated by a user to command the start or stop of a motor 70 (described later) built into the main body 110. Each time the drive switch 17 is pressed, a command is issued to the motor 70 to start and stop alternately.

[0030] The electric working machine 100 has a power switch 11 at the top of the front of the main body 110. The power switch 11 is a dial switch and has a built-in mode switch 11a. The power switch 11 is provided so as to protrude from the window 10a when the cover 10 is closed. The power switch 11 is turned by the user to one of three positions: an interlocking position, an off position, and an on position. The off position corresponds to a position where the main power supply is turned off and the mode switch 11a is turned off. The on position corresponds to a position where the main power supply is turned on and the mode switch 11a is turned off. The interlocking position corresponds to a position where the main power supply is turned on and the mode switch 11a is turned on. The mode switch 11a is a switch for determining whether or not the position is an interlocking position. When the power switch 11 is in the interlocking position, the electric working machine 100 is connected to another electric working machine by wireless communication and interlocks with the other electric working machine. The other electric working machine is, for example, a circular saw. By linking the electric working machine 100 with other electric working machines, the electric working machine 100 can efficiently suck in dust and cutting chips that are generated when the other electric working machines are operating.

[0031] The electric operating machine 100 is provided with battery remaining capacity display units 15a, 15b below the power switch 11 on the front surface of the main body 110. The battery remaining capacity display units 15a, 15b are provided so as to be visible through the window 10a when the cover 10 is closed. The battery remaining capacity display units 15a, 15b notify the remaining capacity of the first and second batteries 200A, 200B. The battery remaining capacity display unit 15a is provided with a light-emitting diode and displays the remaining capacity of the first battery 200A in, for example, three stages. The battery remaining capacity display unit 15b is provided with a light-emitting diode and displays the remaining capacity of the second battery 200B in, for example, three stages. In addition, the battery remaining capacity display units 15a, 15b notify the occurrence of switching when a switching of the energized battery occurs. When the current-carrying battery is switched from the first battery 200A to the second battery 200B, the battery remaining capacity display unit 15a blinks, and the battery remaining capacity display unit 15b displays the remaining capacity of the second battery 200B. The current-carrying battery is one of the first and second batteries 200A, 200B that is conducting electricity to the motor 70.

[0032] The electric operating machine 100 is provided with a display switch 16 between the battery remaining capacity display unit 15a and the battery remaining capacity display unit 15b on the front surface of the main body 110. The display switch 16 is provided so as to be accessible through the window 10a when the cover 10 is closed. When the display switch 16 is pressed by a user, the battery remaining capacity display units 15a, 15b display the remaining capacity of the first and second batteries 200A, 200B for a predetermined period of time.

[0033] The electric working machine 100 includes a speed setting unit 12 below the battery remaining capacity display units 15a and 15b on the front surface of the main body 110. The speed setting unit 12 is a dial-type switch. The speed setting unit 12 is provided so as to protrude from the window 10a when the cover 10 is closed. The speed setting unit 12 is configured to be operated by a user to set the rotation speed of the motor 70. The electric working machine 100 has a plurality of speed modes each having a different target value for the rotation speed. The speed setting unit 12 corresponds to a switch operated to set one of the plurality of speed modes. In this embodiment, the electric working machine 100 has 11 speed modes set from level 0 to level 10. That is, in the electric working machine 100, the target value for the rotation speed is set in 11 stages. The positions to which the speed setting unit 12 can be moved include the positions of the 11 speed modes from level 0 to level 10 and a stop position.

[0034] <1-2. Electrical configuration> Next, the electrical configuration of the electric operating machine 100 will be described with reference to FIG. The electric work machine 100 includes a motor 70. The motor 70 is a three-phase brushless motor. The electric work machine 100 includes a position sensor 71. The position sensor 71 includes three Hall ICs arranged corresponding to the stators of the respective phases of the motor 70. The Hall IC outputs a rotation detection signal to a position detection circuit 41, which will be described later, every time the rotor of the motor 70 rotates a predetermined angle.

[0035] The electric operating machine 100 includes a switch unit 115. The switch unit 115 includes the above-mentioned power switch 11. The power switch 11 outputs a power-on signal to a switch input determination unit 51 (described later) and a power supply circuit 31 in response to the power switch 11 being in the on position or the interlocking position, and outputs a power-off signal to the switch input determination unit 51 in response to the power switch 11 being in the off position.

[0036] The switch unit 115 includes a mode switch 11a. The mode switch 11a outputs a linked-on signal to the switch input determination unit 51 in response to the power switch 11 being located at the linked position, and outputs a linked-off signal to the switch input determination unit 51 in response to the power switch 11 being located at the off position or the on position.

[0037] The electric operating machine 100 includes the above-mentioned drive switch 17. The drive switch 17 outputs a drive-on signal and a drive-off signal alternately to the switch input determination unit 51 every time the drive switch 17 is pressed.

[0038] The electric operating machine 100 is equipped with the speed setting unit 12 described above. The speed setting unit 12 includes a sliding resistor, and outputs a resistance value according to the speed mode in which the speed setting unit 12 is located to a speed command determination unit 54 described later. The electric operating machine 100 is equipped with the display switch 16 described above. When pressed by a user, the display switch 16 outputs a display on signal to a display control unit 59 described later.

[0039] The electric work machine 100 includes a wireless communication unit 20. The wireless communication unit 20 includes a receiver 21 and an antenna 22. The wireless communication unit 200 receives a drive signal for the motor 70 from the other electric work machine via wireless communication, and outputs the received drive signal to the switch input determination unit 51. By receiving a drive signal from the other electric work machine, the wireless communication unit 20 can start or stop the motor 70 in accordance with the operation of the other electric work machine.

[0040] The electric operating machine 100 includes an equipment circuit 30. The equipment circuit 30 includes a power supply circuit 31. The equipment circuit 30 includes a first diode 32A. The power supply circuit 31 is connected to the positive electrode of the first battery 200A via the first diode 32A and the first connection part 210A. The equipment circuit 30 also includes a second diode 32B. The power supply circuit 31 is connected to the positive electrode of the second battery 200B via the second diode 32B and the second connection part 210B. Therefore, the power supply circuit 31 receives power from the first battery 200A or the second battery 200B, whichever has a higher voltage, and generates a predetermined power supply voltage Vcc. The power supply circuit 31 generates the power supply voltage Vcc when a power-on signal is input from the power switch 11 or a circuit-on signal is input from a power supply circuit control unit 52 described later. The power supply circuit 31 supplies the generated power supply voltage Vcc to various circuits in the equipment circuit 30, such as the control circuit 50.

[0041] The device circuit 30 includes a motor drive circuit 35. The motor drive circuit 35 is a three-phase full bridge circuit including three switching elements provided on the high side and three switching elements provided on the low side. The motor drive circuit 35 is connected to a motor 70 and causes a current to flow through the windings of each phase of the motor 70.

[0042] The device circuit 30 includes an electric current supplying unit 33. The electric current supplying unit 33 supplies electricity to either the first connection unit 210A or the second connection unit 210B, and thus to the motor drive circuit 35, and further to the motor 70. The electric current supplying unit 33 includes a first changeover switch 33A. The first changeover switch 33A is a field effect transistor (hereinafter, FET) and is connected between the first connection unit 210A and the motor drive circuit 35. The electric current supplying unit 33 includes a second changeover switch 33B. The second changeover switch 33B is a FET and is connected between the second connection unit 210B and the motor drive circuit 35.

[0043] The first and second changeover switches 33A, 33B are turned on when receiving an on signal from a battery changeover unit 55, which will be described later, and are turned off when receiving an off signal. The battery changeover unit 55 transmits an on signal to one of the first and second changeover switches 33A, 33B, and transmits an off signal to the other. Alternatively, the battery changeover unit 55 transmits an off signal to both the first and second changeover switches 33A, 33B.

[0044] The motor drive circuit 35 receives power from the current-carrying battery, either the first battery 200A or the second battery 200B, which is connected to the selective connection part, and passes a current through the windings of each phase of the motor 70. The selective connection part is the connection part, either the first connection part 210A or the second connection part 210B, that conducts current to the motor drive circuit 35 via the current-carrying part 33. Each switching element of the motor drive circuit 35 is turned on or off in response to a control command output from a control circuit 50, which will be described later.

[0045] The device circuit 30 includes a position detection circuit 41. The position detection circuit 41 detects the rotational position of the rotor of the motor 70 based on a rotation detection signal input from the position sensor 71. The position detection circuit 41 outputs a position signal to the control circuit 50 according to the detected rotational position.

[0046] The device circuit 30 includes a control circuit 50. The control circuit 50 includes a CPU 50a, a ROM 50b, a RAM 50c, an I / O, and the like. The various functions of the control circuit 50 are realized by the CPU 50a executing a program stored in a non-transitive real recording medium. In this embodiment, the ROM 50b corresponds to the non-transitive real recording medium. By executing this program, a method corresponding to the program is executed. Note that some or all of the functions executed by the CPU 50a may be configured in hardware form using one or more ICs, etc. Also, the control circuit 50 may be configured from a single microcomputer, or may be configured from multiple microcomputers. In this embodiment, the control circuit 50 corresponds to an example of a control unit.

[0047] The control circuit 50 includes, as various functions, a switch input determination unit 51, a power supply circuit control unit 52, a battery voltage detection unit 53, a speed command determination unit 54, a battery state determination unit 60, a battery switching unit 55, a rotation speed calculation unit 56, a pulse width modulation (hereinafter, PWM) generation unit 57, a drive control unit 58, and a display control unit 59. In this embodiment, the control circuit 50 includes all of the above-mentioned various functions, but in another embodiment, any of the above-mentioned various functions may be omitted.

[0048] The switch input determination unit 51 determines that there is a drive request when a power-on signal and a drive-on signal are input, and determines that there is no drive request when one or more of a power-off signal and a drive-off signal are input. The switch input determination unit 51 also determines that there is a link request when an interlocking on signal is input. When the switch input determination unit 51 determines that there is a drive request, it outputs a drive request signal to the power circuit control unit 52, the battery switching unit 55, and the PWM generation unit 57. When the switch input determination unit 51 determines that there is an interlocking request, it outputs the drive signal input from the wireless communication unit 20 to the PWM generation unit 57.

[0049] The power supply circuit control unit 52 outputs a circuit-on signal to the power supply circuit 31 when the drive request signal is input. The speed command determination unit 54 sets a target value for the rotation speed based on the resistance value input from the speed setting unit 12, and outputs the set target value to the battery switching unit 55 and the PWM generation unit 57. The target value for the rotation speed corresponds to a target rotation speed or a target duty.

[0050] The rotation speed calculation unit 56 calculates the actual rotation speed of the motor 70 based on the position signal input from the position detection circuit 41, and outputs the calculation result to the PWM generation unit 57. The battery state determination unit 60 receives a discharge permission signal or a discharge prohibition signal from the first battery 200A via the first connection unit 210A, and determines whether the first battery 200A is in a state where discharge is possible. Similarly, the battery state determination unit 60 receives a discharge permission signal or a discharge prohibition signal from the second battery 200B via the second connection unit 210B, and determines whether the second battery 200B is in a state where discharge is possible. The battery state determination unit 60 outputs the battery state determination results of the first battery 200A and the second battery 200B to the battery switching unit 55 and the display control unit 59.

[0051] The battery voltage detection unit 53 detects the voltage value of the first battery 200A (hereinafter referred to as the first voltage value) and the voltage value of the second battery 200B (hereinafter referred to as the second voltage value), and outputs the detected first voltage value and second voltage value to the battery switching unit 55 and the display control unit 59.

[0052] The battery switching unit 55 controls the current supply unit 33 based on the first voltage value, the second voltage value, the battery state determination result, the drive request signal, and the target value for the rotation speed. That is, the battery switching unit 55 outputs a switch-on signal or a switch-off signal to the first and second switches 33A and 33B based on various input signals. The battery switching unit 55 also outputs a switch-on signal or a switch-off signal to the display control unit 59.

[0053] The PWM generating unit 57 generates a PWM signal based on the drive request signal, the target value for the rotation speed, and the calculation result of the rotation speed. Alternatively, the PWM generating unit 57 generates a PWM signal based on the drive signal input from the wireless communication unit 20 via the switch input determining unit 51. The PWM generating unit 57 outputs the generated PWM signal to the drive control unit 58.

[0054] The drive control unit 58 generates a control command based on the PWM signal input from the PWM generation unit 57, and outputs the generated control command to the motor drive circuit 35. As a result, a pulse voltage based on the PWM signal is applied to the windings of each phase of the motor 70.

[0055] The device circuit 30 also includes a display circuit 42. A display control unit 59 turns on, blinks, or turns off the remaining battery capacity display units 15a and 15b via the display circuit 42 based on a display-on signal, the first voltage value, the second voltage value, the battery state determination result, or a switch-on or switch-off signal.

[0056] <1-3. Processing> <1-3-1. Motor drive processing> Next, the motor drive process executed by the control circuit 50 will be described with reference to the flowchart of Fig. 4. The control circuit 50 starts this process when started up.

[0057] First, in S10, the driving of the motor 70 is stopped. Next, in S20, the input of each switch is judged, that is, the on / off state or position of each switch is judged.

[0058] Next, in S30, the speed mode set by the speed setting unit 12 is obtained. Next, in S40, the battery state determination results of the first battery 200A and the second battery 200B are obtained.

[0059] Next, in S50, the first voltage value and the second voltage value are obtained. Next, in S60, a power-on battery determination process is executed. Specifically, it is determined which of the first battery 200A and the second battery 200B is to be discharged first. The power-on battery determination process will be described in detail later.

[0060] Next, in S70, it is determined whether or not the drive switch 17 has been pressed while the motor 70 is stopped. If it is determined that the drive switch 17 has been pressed, the process proceeds to S80, and if it is determined that the drive switch 17 has not been pressed, the process returns to S10. Although omitted in the flowchart shown in FIG. 4, if the drive switch 17 is pressed while the motor 70 is operating, the process returns to S10.

[0061] In S80, a battery switching process is executed. Specifically, when it is necessary to change the connected battery, the selected connection unit and therefore the current-carrying battery are changed via the current-carrying unit 33. The battery switching process will be described in detail later.

[0062] Next, in S90, a target duty or a target rotation speed is acquired as a target value related to the rotation speed. In this embodiment, a target duty is acquired. Specifically, as shown in FIG. 9, a first table showing the correspondence between each speed mode and a target duty is created in advance and stored in the ROM 50b. In S90, the target duty is acquired based on the speed mode set by the speed setting unit 12 and the first table.

[0063] Next, in S100, the actual rotation speed of the motor 70 is obtained. Next, in S110, a motor output process is executed. Specifically, an output duty is calculated based on the acquired target duty, and a PWM signal based on the calculated output duty is generated. Furthermore, a control command is generated based on the generated PWM signal, and the generated control command is output to the motor drive circuit 35. The motor output process will be described in detail later.

[0064] <1-3-2. Powered battery determination process> Next, the powered battery determination process executed by the control circuit 50 in S60 will be described with reference to the flowcharts of FIGS. 5A to 5C.

[0065] In S200, a first threshold value and a second threshold value are obtained based on the set speed mode. The first threshold value corresponds to a voltage value for determining whether the first and second batteries 200A, 200B can be discharged when the motor 70 is started. The second threshold value corresponds to a voltage value for determining whether the current-carrying battery cannot be discharged while discharging the current-carrying battery. When the current-carrying battery cannot be discharged, the control circuit 50 automatically switches the current-carrying battery to another battery while the motor 70 is being driven.

[0066] If a single threshold value is used to determine the battery to be energized with the motor 70, switching between the first battery 200A and the second battery 200B may occur automatically and frequently during the operation of the motor 70. For example, when the first voltage value falls below a predetermined threshold, if the energizing battery is switched from the first battery 200A to the second battery 200B, the first voltage value rises by the amount of voltage drop of the first battery 200A. Therefore, the first voltage value may exceed the predetermined threshold. As a result, when the second voltage value falls below the predetermined threshold, the energizing battery is switched from the second battery 200B to the first battery 200A, and the second voltage value rises by the amount of voltage drop of the second battery 200B. Then, when the first battery 200A is discharged, the first voltage value immediately falls below the predetermined threshold, and switching of the energizing battery occurs. Therefore, switching of the energizing battery frequently occurs between two batteries whose voltage values ​​are close to the predetermined threshold. Furthermore, the power supply to the motor 70 is frequently stopped and started repeatedly when the power supply battery is switched, which gives the user an uncomfortable feeling.

[0067] Therefore, in this embodiment, in order to prevent frequent automatic switching of the power supply battery while the motor 70 is being driven, a first threshold value and a second threshold value are used to determine the battery to be powered to the motor 70. The first threshold value is larger than the second threshold value, and the difference between the first threshold value and the second threshold value is larger than the amount of voltage drop of the first and second batteries 200A, 200B.

[0068] When the battery voltage value of the first and second batteries 200A, 200B falls below the protection threshold, the first and second batteries 200A, 200B determine that an abnormal state exists and request the electric operating machine 100 to prohibit discharging. The protection threshold is set according to the type of the first and second batteries 200A, 200B. Therefore, depending on the type of the first and second batteries 200A, 200B, the protection threshold may be larger than the second threshold, and discharging of the energized battery may be stopped before the voltage value of the energized battery falls below the second threshold.

[0069] Here, it is also conceivable to continue discharging the current-carrying battery until the current-carrying battery requests the prohibition of discharging without setting the second threshold. However, the protection threshold of the first and second batteries 200A, 200B may be set relatively high or relatively low depending on the type. When the protection threshold is set relatively low, if the current-carrying battery is continued to be discharged until the voltage value of the current-carrying battery falls below the protection threshold, the output of the electric working machine 100 may decrease, and the working performance may deteriorate. In addition, when the protection threshold is set relatively low, if the current-carrying battery is switched to a fully charged battery (a battery with a large remaining capacity) after the current-carrying battery is continued to be discharged until the voltage value of the current-carrying battery falls below the protection threshold, the rotation speed of the motor 70 increases abruptly, giving the user a great sense of discomfort. Therefore, in order to make the user's usability constant regardless of the type of the first and second batteries 200A, 200B, the second threshold is set on the electric working machine 100 side.

[0070] As shown in FIG. 6, a second table showing the correspondence between each of the speed modes and the first and second thresholds is created in advance and stored in the ROM 50b. Specifically, the first and second thresholds are set low according to the speed reduction (i.e., the speed level reduction) corresponding to the speed mode. The load on the motor 70 differs according to the speed mode, and the voltage drop amount of the first and second batteries 200A, 200B differs. In the low speed mode, the load on the motor is small and the voltage drop amount is small. Therefore, in the low speed mode, the first and second thresholds are set lower than in the high speed mode, thereby increasing the dischargeable capacity of the first and second batteries 200A, 200B. In S200, the first and second thresholds are acquired based on the set speed mode and the second table. In this embodiment, both the first and second thresholds are set low according to the speed reduction corresponding to the speed mode, but only one of the first and second thresholds may be set low.

[0071] Next, in S210, it is determined whether or not a discharge permission signal is received from the first battery 200A and the first voltage value is equal to or greater than the first threshold value. If it is determined that a discharge permission signal is received from the first battery 200A and the first voltage value is equal to or greater than the first threshold value, the process proceeds to S220.

[0072] In S220, it is determined that the first battery 200A can be discharged. If it is determined in S210 that a discharge inhibition signal has been received from the first battery 200A, or that the first voltage value is less than the first threshold value, the process proceeds to S230.

[0073] In S230, it is determined that the first battery 200A cannot be discharged. Next, in S240, it is determined whether or not a discharge permission signal is received from the second battery 200B and the second voltage value is equal to or greater than the first threshold value. If a discharge permission signal is received from the second battery 200B and it is determined that the second voltage value is equal to or greater than the first threshold value, the process proceeds to S250.

[0074] In S250, it is determined that second battery 200B is capable of being discharged. If it is determined in S240 that a discharge inhibition signal has been received from the second battery 200B, or that the second voltage value is less than the second threshold value, the process proceeds to S260.

[0075] In S260, it is determined that the second battery 200B cannot be discharged. Next, in S270, it is determined whether or not the motor 70 is being driven. If it is determined that the motor 70 is not being driven, the process proceeds to S280.

[0076] In S280, it is determined whether or not the first battery 200A is determined to be dischargeable based on the processing results in S220 and S230. If the first battery 200A is determined to be dischargeable, the process proceeds to S290, and if the first battery 200A is determined to be non-dischargeable, the process proceeds to S300.

[0077] In S290, the first battery 200A is selected as the battery to supply current to the motor 70. In S300, it is determined whether or not the second battery 200B is determined to be dischargeable based on the processing results in S250 and S260. If the second battery 200B is determined to be dischargeable, the process proceeds to S310, and if the second battery 200B is determined to be non-dischargeable, the process proceeds to S320.

[0078] In S310, the second battery 200B is selected as the battery to supply current to the motor 70. The determination of whether the first battery 200A can be discharged is performed before the determination of whether the second battery 200B can be discharged. As a result, if the first battery 200A can be discharged, the first battery 200A is used preferentially even if the second battery 200B can be discharged.

[0079] In S320, it is determined that there is no dischargeable battery. If it is determined in S270 that the motor 70 is being driven, the process proceeds to S330.

[0080] In S330, it is determined whether the first battery 200A is energized with the motor 70. That is, it is determined whether the first connection part 210A is energized with the motor 70. If it is determined that the first battery 200A is energized, the process proceeds to S340. In S340, the first battery 200A is set as the energized battery, and the second battery 200B is set as the non-energized battery.

[0081] In S330, if it is determined that the first battery 200A is not energized, that is, if it is determined that the second battery 200B is energized, the process proceeds to S350. In S350, the second battery 200B is set as the energized battery, and the first battery 200A is set as the non-energized battery.

[0082] Next, in S360, it is determined whether the voltage value of the energized battery was not less than the second threshold value. Since the energized battery is discharging in this case, it is determined whether the discharging can be continued using the second threshold value.

[0083] If it is determined in S360 that the voltage value of the energized battery is equal to or greater than the second threshold value, there is no need to change the battery being used, and the process proceeds to S410. If it is determined in S360 that the voltage value during power supply is less than the second threshold, the process proceeds to S370. In S370, it is determined whether the non-powered battery can be discharged. If it is determined that the non-powered battery can be discharged, the process proceeds to S380. In S380, the non-powered battery is selected as the battery to be powered to the motor 70.

[0084] If it is determined in S370 that the non-powered battery cannot be discharged, the process proceeds to S390. In S390, it is determined whether or not a discharge permission signal has been received from the powered battery. If it is determined that a discharge permission signal has been received from the powered battery, the process proceeds directly to S410. If the non-powered battery cannot be discharged, there is no battery that can be replaced. Therefore, discharge from the powered battery continues until a discharge prohibition signal is received from the powered battery. Note that if there is no battery that can be replaced, the discharge of the powered battery may be immediately stopped.

[0085] If it is determined in S390 that a discharge prohibition signal has been received from a live battery, the process proceeds to S400. In S400, it is determined that there is no dischargeable battery, and the process proceeds to S410.

[0086] Next, in S410, it is determined whether the selected battery has been changed. That is, it is determined whether the process of S380 has been executed. If it is determined that the selected battery has been changed, the selected battery is set as the current battery and the current battery is updated. As a result, the battery remaining capacity display units 15a and 15b display for a predetermined period of time to notify the user that the current battery has been changed. Then, the process proceeds to S70.

[0087] If it is determined in S410 that the selected battery has not been changed, the process proceeds to S70. <1-3-3. Battery switching process> Next, the battery switching process executed by the control circuit 50 in S80 will be described with reference to the flowchart of FIG.

[0088] In S500, it is determined whether or not there is a live battery. If it is determined that there is no live battery, that is, if there is no dischargeable battery, the process proceeds to S510. In S510, the first and second changeover switches 33A and 33B are both turned off. That is, the first and second connection parts 210A and 210B are both put in a non-conductive state with the motor 70. As a result, neither the first nor the second battery 200A or 200B is discharged. Then, the process proceeds to S90.

[0089] If it is determined in S500 that there is a live battery, the process proceeds to S520. In S520, it is determined whether or not the result of the live battery determination process in S60 has changed from no live battery to live battery. If it is determined that there has been a change from no live battery to live battery, the process proceeds to S550. If it is determined that there has not been a change from live battery to no live battery, the process proceeds to S530.

[0090] In S530, it is determined whether the powered battery has been changed as a result of the powered battery determination process in S60. If it is determined that the powered battery has not been changed, the process proceeds to S550. If it is determined that the powered battery has been changed, the process proceeds to S540.

[0091] In S540, the switching request flag is set. As a result, a second soft start is executed when the motor 70 is restarted in response to a change in the power supply battery. The second soft start is different from the first soft start executed when the motor 70 is started in response to the operation of the drive switch 17. Then, the process proceeds to S550.

[0092] In S550, of the first and second changeover switches 33A, 33B, the switch on the side of the energized battery is turned on, and the switch on the side of the non-energized battery is turned off. When the energized battery is changed, both the first and second changeover switches 33A, 33B are turned off once to prevent charging and discharging between the first battery 200A and the second battery 200B. After that, the switch on the side of the energized battery is turned on. Then, the process proceeds to S90.

[0093] <1-3-4. Motor output processing> Next, the motor output process executed by the control circuit 50 in S110 will be described with reference to the flowchart of FIG.

[0094] In S600, it is determined whether or not the switching request flag has changed from clear to set as a result of executing the battery switching process in S80. In other words, it is determined whether or not a change in the powered battery has occurred. If it is determined that the switching request flag has changed from clear to set, the process proceeds to S610.

[0095] In S610, the output duty is changed to 0%. Here, in order to execute a soft start, the output duty is temporarily set to 0% and power supply to the motor 70 is stopped. A soft start is a start in which the rotation speed of the motor 70 is gradually increased until the output duty reaches the target duty or until the actual rotation speed reaches the target rotation speed. In this embodiment, in the soft start, the rotation speed of the motor 70 is gradually increased until the output duty reaches the target duty.

[0096] If it is determined in S610 that the switching request flag has not changed from cleared to set, the process proceeds to S620. In S620, it is determined whether the switching request flag is set. That is, it is determined whether the motor 70 is started in response to the operation of the drive switch 17 or in response to switching of the power supply battery. The start of the motor 70 in response to the operation of the drive switch 17 (hereinafter referred to as normal start) is the start of the motor 70 in response to the user's intention. When the motor 70 is started in response to the user's intention, a first soft start is executed.

[0097] On the other hand, the start of the motor 70 accompanying the switching of the current-carrying battery (hereinafter referred to as the start at the time of switching) is the start of the motor 70 that is not intended by the user. Therefore, if the first soft start is executed at the start at the time of switching, a large change in the rotation speed occurs that is not intended by the user, which gives the user a sense of discomfort. Therefore, the second soft start is executed at the start at the time of switching. In the second soft start, the rotation speed is increased more slowly than in the first soft start in order to suppress the sense of discomfort given to the user. In other words, in the second soft start, the rate of increase in the rotation speed is reduced more than in the first soft start.

[0098] As shown in FIG. 9, the first table includes correspondence between each speed mode and the target duty, as well as correspondence between each speed mode and the increased duty at startup during normal operation and the increased duty at startup during switching. The increased duty at startup during switching is smaller than the increased duty at normal operation in order to gradually increase the output duty. Specifically, the increased duty at startup during switching is set to half or less of the increased duty at normal operation. As a result, the second rate of increase at the time of execution of the second soft start is half or less of the first rate of increase at the time of execution of the first soft start. The first rate of increase is the rate of increase of the rotation speed at the time of execution of the first soft start, and the second rate of increase is the rate of increase of the rotation speed at the time of execution of the second soft start.

[0099] Also, the increased duty in normal startup is constant regardless of the speed mode. On the other hand, the increased duty in startup at switching differs depending on the speed mode. That is, in startup at switching, the increase rate of the rotation speed changes depending on the speed mode. Specifically, the increased duty is set lower depending on the decrease in speed corresponding to the speed mode. If the second increase rate in the low speed mode is set to be the same as the second increase rate in the high speed mode, the user will not easily realize that the increase in the rotation speed is more gradual in startup at switching in the low speed mode than in the first soft start. Therefore, in startup at switching in the low speed mode, the increased duty is set lower than in startup at switching in the high speed mode to reduce the increase rate of the rotation speed.

[0100] If it is determined in S620 that the switching request flag is not set, the process proceeds to S630, and if it is determined that the switching request flag is set, the process proceeds to S640.

[0101] In S630, the increased duty is set to the increased duty during normal startup, and the process proceeds to S650. In S640, the increased duty is set to the increased duty at the start when switching according to the speed mode, and the process proceeds to S650.

[0102] In S650, the increased duty set in S630 or S640 is added to the output duty to update the output duty. Next, in S660, it is determined whether the output duty updated in S650 is equal to or greater than the target duty acquired in S90. If it is determined that the output duty is less than the target duty, a control command based on the output duty is output to the motor drive circuit 35, and the process returns to S20.

[0103] If it is determined in S660 that the output duty is equal to or greater than the target duty, the process proceeds to S670. In S670, the output duty is set to the target duty, and a control command based on the output duty is output to the motor drive circuit 35. Next, in S680, the switching request flag is cleared, and the process returns to S20.

[0104] <1-4. Operation> An example of the change over time in the rotation speed of the motor 70 when the motor drive process according to this embodiment is executed and the change over time in the rotation speed according to the reference example are shown by dashed lines in FIG.

[0105] 10, at time t0, the drive switch 17 is operated to start driving the motor 70. Since the start of driving here is in response to the user's intention, the control circuit 50 executes a first soft start.

[0106] At time t1, automatic switching of the current-carrying battery occurs in response to a decrease in the capacity of the current-carrying battery. In this embodiment, the second soft start is executed at time t1, and the rotation speed increases gradually over a period T2 from time t1 to time t3. On the other hand, in the reference example, the first soft start is executed at time t1, and the rotation speed increases over a period T1 from time t1 to time t2. Since the period T1 is shorter than the period T2, when the first soft start is executed, the rotation speed changes significantly in a short period of time. On the other hand, when the second soft start is executed, the rotation speed changes over a longer period than the first soft start, so the user is less likely to feel uncomfortable.

[0107] <1-5.Effects> According to the first embodiment described above in detail, the following effects are achieved. (1) The electric working machine 100 executes a first soft start when a command to start the motor 70 is issued via the drive switch 17. Furthermore, the electric working machine 100 executes a second soft start when the current-carrying battery is changed. In the second soft start, the rotation speed of the motor 70 increases more slowly than in the first soft start, so that a relatively large change in the rotation speed does not occur in a short period of time. Therefore, it is possible to prevent the user from feeling uncomfortable when the current-carrying battery is changed.

[0108] (2) In the second soft start, the output duty is increased more gradually than in the first soft start, so that a relatively large change in the rotation speed of the motor 70 at startup can be suppressed.

[0109] (3) In the second soft start, by changing the increase rate of the output duty according to the set speed mode, the user can easily feel that the increase in rotation speed is more gradual in the second soft start than in the first soft start.

[0110] (4) In the second soft start, when the low-speed mode is set, the increase rate of the output duty is reduced compared to when the high-speed mode is set. This makes it possible to prevent the user from feeling uncomfortable when the power supply battery is changed in the low-speed mode.

[0111] (5) The rate of increase in the output duty during the second soft start is suppressed to less than half of the rate of increase in the output duty during the first soft start. This allows the user to feel that the increase in rotation speed during the second soft start is more gradual than during the first soft start.

[0112] 2. Second Embodiment <2-1. Differences from the first embodiment> The second embodiment has a basic configuration similar to that of the first embodiment, and therefore differences will be described below. Note that the same reference numerals as those in the first embodiment indicate the same configuration, and the preceding description will be referred to.

[0113] In the first embodiment described above, the rotation speed of the motor 70 is controlled without feedback. In contrast, the second embodiment differs from the first embodiment in that the rotation speed of the motor 70 is feedback controlled. That is, in the second embodiment, the motor output process of the motor drive process shown in FIG. 4 is different from the first embodiment.

[0114] In the second embodiment, the target rotation speed is obtained in the process of S90 of the motor drive process shown in Fig. 4. As shown in Fig. 12, a third table showing the correspondence between each speed mode and the target rotation speed is created in advance and stored in the ROM 50b. In S90, the target rotation speed is obtained based on the speed mode set by the speed setting unit 12 and the third table.

[0115] <2-2. Motor output processing> Next, the motor output process executed by the control circuit 50 in S110 will be described with reference to the flowcharts of FIGS. 11A and 11B.

[0116] In S700, it is determined whether or not the switching request flag has changed from clear to set as a result of executing the battery switching process in S80. If it is determined that the switching request flag has changed from clear to set, the process proceeds to S710.

[0117] In S710, the command rotation speed is changed to 0 rpm. Here, in order to execute a soft start, the command rotation speed is temporarily set to 0 rpm and the motor 70 is stopped. If it is determined in S710 that the switching request flag has not changed from clear to set, the process proceeds to S720. In S720, it is determined whether the switching request flag is set. In other words, it is determined whether the startup is normal or switching.

[0118] As shown in FIG. 12, the third table includes, in addition to the correspondence between each speed mode and the target rotation speed, the correspondence between each speed mode and the increased rotation speed at startup during normal operation and the increased rotation speed at startup during switching. The increased rotation speed at startup during switching is smaller than the increased rotation speed at normal operation in order to gradually increase the command rotation speed. Specifically, the increased rotation speed at startup during switching is set to half or less of the increased rotation speed at normal operation. As a result, the second increase rate at the time of execution of the second soft start is half or less of the first increase rate at the time of execution of the first soft start.

[0119] Also, the increased number of rotations during normal startup is constant regardless of the speed mode. On the other hand, the increased number of rotations during startup at the time of switching differs depending on the speed mode. That is, during startup at the time of switching, the rate of increase in the number of rotations changes depending on the speed mode. Specifically, the increased number of rotations is set to be smaller depending on the decrease in speed corresponding to the speed mode.

[0120] If it is determined in S720 that the switching request flag is not set, the process proceeds to S730, and if it is determined that the switching request flag is set, the process proceeds to S740.

[0121] In S730, the increased rotation speed during normal startup is set as the increased rotation speed, and the process proceeds to S750. In S740, the increased rotation speed at the start when switching according to the speed mode is set as the increased rotation speed, and the process proceeds to S750.

[0122] In S750, the increased rotation speed set in S730 or S740 is added to the command rotation speed to update the command rotation speed. Next, in S760, it is determined whether the command rotation speed updated in S750 is equal to or greater than the target rotation speed acquired in S90. If it is determined that the command rotation speed is less than the target rotation speed, the process proceeds to S790.

[0123] If it is determined in S760 that the command speed is equal to or greater than the target speed, the process proceeds to S770. In S770, the command speed is set to the target speed. Then, in S780, the switching request flag is cleared, and the process proceeds to S790.

[0124] In S790, it is determined whether the command rotation speed is about 0 rpm. If it is determined that the command rotation speed is 0 rpm, the process proceeds to S800. In S800, the output duty is set to 0%, and a control command according to the output duty is output to the motor drive circuit 35, and the process returns to S20.

[0125] If it is determined in S790 that the command speed is not 0 rpm, the process proceeds to S810. In S810, a reference duty corresponding to the commanded rotation speed is obtained. As shown in Fig. 13, a fourth table showing the correspondence between the commanded rotation speed and the reference duty is created in advance and stored in the ROM 50b. In S810, the reference duty is obtained from the commanded rotation speed and the fourth table.

[0126] Next, in S820, the rotation difference Diff between the command rotation speed and the actual rotation speed obtained in S100 is calculated. Next, in S820, the rotation difference Diff calculated in S820 is multiplied by the proportional gain GP to calculate the proportional correction amount Off_P.

[0127] Next, in S840, the rotation difference Diff calculated in S820 is added to the cumulative difference Diff_int to update the cumulative difference Diff_int. Next, in S850, the cumulative difference Diff_int updated in S840 is multiplied by the integral gain GI to calculate the integral correction amount Off_I.

[0128] Next, in S860, the proportional correction amount Off_P calculated in S830 and the integral correction amount Off_I calculated in S850 are added to the reference duty acquired in S810 to calculate the output duty.

[0129] In S870, it is determined whether the output duty calculated in S860 is greater than 100%. If it is determined in S870 that the output duty is less than or equal to 100%, a control command based on the output duty is output to the motor drive circuit 35, and the process returns to S20.

[0130] If it is determined in S870 that the output duty is greater than 100%, the process proceeds to S880, in which the output duty is set to 100%, a control command based on the output duty is output to the motor drive circuit 35, and the process returns to S20.

[0131] <2-3.Effects> According to the second embodiment described above in detail, in addition to the effect (1) of the first embodiment described above, the following effect is achieved.

[0132] (6) In the second soft start, the command rotation speed is increased more gradually than in the first soft start, so that a relatively large change in rotation speed at the start of the motor can be suppressed.

[0133] (7) In the second soft start, by changing the increase rate of the commanded rotation speed according to the set speed mode, the user can easily realize that the increase in rotation speed is more gradual in the second soft start than in the first soft start.

[0134] (8) In the second soft start, when the low speed mode is set, the increase rate of the commanded rotation speed is reduced compared to when the high speed mode is set. This makes it possible to prevent the user from feeling uncomfortable when the powered battery is changed in the low speed mode.

[0135] (9) The rate of increase in the command speed during the second soft start is suppressed to half or less of the rate of increase in the command speed during the first soft start. This allows the user to realize that the increase in speed during the second soft start is more gradual than during the first soft start.

[0136] 3. Other Embodiments Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above-described embodiments and can be implemented in various modified forms.

[0137] (a) In the above embodiment, the electric working machine 100 has been described as a dust collector, but the electric working machine 100 is not limited to a dust collector. For example, the electric working machine 100 may be a blower, a power tool such as a hammer drill, or a gardening tool such as a grass cutter.

[0138] (b) Multiple functions possessed by one component in the above embodiments may be realized by multiple components, or one function possessed by one component may be realized by multiple components. Also, multiple functions possessed by multiple components may be realized by one component, or one function realized by multiple components may be realized by one component. Also, part of the configuration of the above embodiments may be omitted. Also, at least part of the configuration of the above embodiments may be added to or substituted for the configuration of another of the above embodiments. [Explanation of symbols]

[0139] 10...cover, 11...power switch, 12...speed setting section, 15a, 15b...battery remaining capacity display section, 16...display switch, 17...drive switch, 20...wireless communication unit, 30...equipment circuit, 31...power circuit, 33...current flow section, 33A, 33B...second changeover switch, 33A...first changeover switch, 35...motor drive circuit, 41...position detection circuit, 42...display circuit, 50...control circuit, 70...motor, 71...position sensor, 100...electric work machine, 200A...first battery, 200B...second battery, 210A...first connection section, 210B...second connection section.

Claims

1. A motor; a first connection portion configured to connect to a first battery; a second connection portion configured to connect to a second battery; an electric current supply unit configured to energize a selective connection unit, which is one of the first connection unit and the second connection unit, with the motor; An operation unit configured to be operated to command starting or stopping of the motor; a control unit configured to execute a first soft start for increasing a rotation speed of the motor at a first increase rate in response to a command to start the motor being issued via the operation unit, and to execute a second soft start for increasing the rotation speed at a second increase rate smaller than the first increase rate in response to a change in the selective connection unit via the current supply unit. Electric work equipment.

2. The control unit is configured to control the motor based on a pulse width modulated signal; a duty cycle of the pulse width modulation signal is increased at a first increase rate when the first soft start is performed, and a duty cycle of the pulse width modulation signal is increased at a second increase rate that is smaller than the first increase rate when the second soft start is performed. The electric operating machine according to claim 1 .

3. A rotation speed detection unit configured to detect the rotation speed of the motor, The control unit is The motor is controlled so that the rotation speed detected by the rotation speed detection unit becomes a target rotation speed, a command rotation speed, which is a command value of the rotation speed for the motor, is increased at a third increase rate when the first soft start is performed, and a command rotation speed, which is a command value of the rotation speed for the motor, is increased at a fourth increase rate which is smaller than the third increase rate when the second soft start is performed.

3. The electric operating machine according to claim 1 or 2.

4. A speed setting unit configured to be operated to set one of a plurality of speed modes having mutually different target values ​​related to the rotation speed, The control unit is The motor is driven based on the target value of the speed mode set via the speed setting unit, When the second soft start is executed, the second increase rate is changed in accordance with a speed mode set via the speed setting unit. The electric operating machine according to any one of claims 1 to 3.

5. the plurality of speed modes include a first mode and a second mode in which the target value is smaller than that in the first mode, The control unit is configured to, when the second mode is set via the speed setting unit, reduce the second increase rate compared to when the first mode is set via the speed setting unit during execution of the second soft start. The electric operating machine according to claim 4.

6. The second rate of increase is less than half of the first rate of increase. The electric operating machine according to any one of claims 1 to 5.

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